Photoelectrocatalytic reduction of CO_2 to methanol over a photosystem Ⅱ-enhanced Cu foam/Si-nanowire system

查看全文 作　　者：Zichao [1]Lian;Donglai [1]Pan;Wenchao [1]Wang;Dieqing [1]Zhang;Guisheng [1]Li;Hexing [1]Li

机构地区：[1]Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University

出　　处：《Journal of Environmental Sciences》索引2017年第29卷第10期,共6页

基　　金：supported by the National Natural Science Foundation of China (No. 21477079, 21677099, 21237003);the Shanghai Government (No. 11ZR1426300, 13YZ054, 14ZR1430900);the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1269);the International Joint Laboratory on Resource Chemistry (No. IJLRC) 摘　　要：A solar-light double illumination photoelectrocatalytic cell(SLDIPEC) was fabricated for autonomous CO_2 reduction and O_2 evolution with the aid of photosystem II(PS-II, an efficient light-driven water-oxidized enzyme from nature) and utilized in a photoanode solution. The proposed SLPEC system was composed of Cu foam as the photoanode and p-Si nanowires(Si-NW) as the photocathode. Under solar irradiation, it exhibited a super-photoelectrocatalytic performance for CO_2 conversion to methanol, with a high evolution rate(41.94 mmol/hr), owing to fast electron transfer from PS-II to Cu foam.Electrons were subsequently trapped by Si-NW through an external circuit via bias voltage(0.5 V), and a suitable conduction band potential of Si(-0.6 e V) allowed CO_2 to be easily reduced to CH_3 OH at the photocathode. The constructed Z-scheme between Cu foam and Si-NW can allow the SLDIPEC system to reduce CO_2(8.03 mmol/hr) in the absence of bias voltage. This approach makes full use of the energy band mismatch of the photoanode and photocathode to design a highly efficient device for solving environmental issues and producing clean energy. 关键词：硅纳米线 CO2 泡沫铜光系统Ⅱ 电催化还原甲醇光电阴极进化速率

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Photoelectrocatalytic reduction of CO_2 to methanol over a photosystem Ⅱ-enhanced Cu foam/Si-nanowire system

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